html.body{
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.step-con{
  width: 100%;
  height: auto;
  overflow: hidden;
}
img{
  display: block;
  width: 100%;
}
.step-con>img:nth-of-type(1){
  height: 831px;
}
.step-con>img:nth-of-type(2){
  height: 914px;
}
.step-con>img:nth-of-type(3){
  height: 798px;
}
.step-con>img:nth-of-type(4){
  height: 811px;
}
.step-con>img:nth-of-type(5){
  height: 826px;
}
.step-con>img:nth-of-type(6){
  height: 987px;
}